It could be you have what is known as a 2 wire arrangement for these lights. I don’t think that is compatible with Lightwaverf normal gen1 master / dimmer operation which expect the normal 3 wire method.

If you can’t change the wiring to suit then an alternative would be to wire the dual gang master as a standalone and then use a dual gang wirefree slave which is battery powered and paired with the master to allow it to control it.

It works in the sense that the switches both go orange. The master can control the lights. The slave knows the state of the lights, ie. goes blue when master turns them on, but will not actually control the lights itself.
Lightwave think the slave is faulty so a replacement is arriving today.

If not – I’ll ask the sparky to tidy up the slave wiring and I’ll bang a wireless switch where the slave currently sits.

It could be you have what is known as a 2 wire arrangement for these lights. I don’t think that is compatible with Lightwaverf normal gen1 master / dimmer operation which expect the normal 3 wire method.

If you can’t change the wiring to suit then an alternative would be to wire the dual gang master as a standalone and then use a dual gang wirefree slave which is battery powered and paired with the master to allow it to control it.

Note that article refers to the latest ‘Smart’ series dimmers which do 2 way (or multiway) switching by grouping devices together in the app and using the signal transmitted from the devices to link them together. There is no master / slave device as such although you do nominate one of the devices as the master.

If you have Gen1 or 2 devices where there was specific master and slave devices then that article does not apply and you need to look at the one specific for those devices.